Upload existing models to modelDB interface

[YujiOshima]

ModelDB provides nice UI.
Enabled to upload models that are not the Katib managed trail would be nice.
Add model upload API to Katib manager and commands to katib-cli.
In my idea, cli is like below.

katib-cli upload --parameter "{'paramA':20,'paramB':'cat'}" --metrics "{'accuracy':0.9,'recall':0.7}" --pvc nfs --path logs/model1 

--parameter and --metrics are optional but you can sort with these parameters in the UI.
Setting pvc and path correctly, katib create TF-board link.

cc @jlewi

[YujiOshima]

/assign @YujiOshima